Some advice:

While you still can this summer, buy your toddler a pair of sandals. I got some great ones at Land's End for $20 that fit well. DD loves to help water the yard and otherwise ends up with wet feet a lot, and when her shoes get soaked, it takes a day or two for them to dry. The sandals have lasted over a larger range of shoe sizes, and served as back-up shoes for any occasion where the regular shoes became unwearable.

Now that summer's begun, ;) , retailers will start putting sandals on their end-of-season closeouts, so there may be bargains.